Reciprocating pump



June 14 1927. 1,632,436

L. DINESEN RECIPROCATING PUMP Filed Nov. 27, 1925 2 Sheets-Sheet 1 l 0 wI 0 fire/1 for 1,632,436 June 14 1927- DINESEN RECIPROCATING PUMP FiledNov. 27. 1925 2 Sheets-Sheet 2 jig J 3 his 1479597208): MAM ff (7 1x.

Patented June 14, 1927.

r can LAURIE-8 DINESEN, OF MINNEAPOLIS, MINNESOTA.

morraooa'rme rumr.

' Application filed November 27, 1925. Serial No. 71,680.

The present invention relates to opposed reciprocating pumps and isdirected to the improvement of pumps of this type and primarily to pumpsof said type designed for use as vacuum pumps. The ob'ects of theinvention, generally stated, are silnplicit of construction, efiiciencin action, ease o assembling for use an disassembling for repairs or forcleaning, silence in action andv ended piston on the line 4-4 of Fig. 5;

Fig. 5- is a vertical section taken on the line 5-5 of Fig. 2, someparts being shown in full;

Fig. 6 is a transverse vertical section on the line 6-6 of Fig. 5; and

Figs. 7 8, 9 and 10 are detail views in elevation showingthe elements ofan exhaust mufiler that is applied at the exhaust port from the pumpcasing.

The body of the pump is in the form of a casing 11 shown as ofapproximately rectangular form and provided at one side with a removablehead late 12 detachably secured thereto 'by mac ine screws 13 or thelike. This casing is formed with diametricall aligned opposed cylinders14 and at one si e it is formed with a bearin sleeve 15 that is axiallyaligned with a earing sleeve 16 formed on the head plate 12. The Acommon axis of the bearing sleeves15 extends at' a ri ht angle to thecommon axis of the cylinders 14, and said two axes lie in the samehorizontal plane. In its upper portion, the casing 11 is formed with anair intake duct 17 that leads from a centrally located air intake port18 and extends therefrom in opposite directions to the opposite ends ofthe cylinders 14. The port 18 will be connected to a vacuum tank orother place from which air is to be drawn to produce suction or partialvacuum.

The cylinders '14 are provided with detachable cylinder heads 19detachably 'secured thereto b machine screws 20 or the like. Thesecylinder heads 19 are made tuhular or hollow by air-intake ports 21,their outer ends being tightly closed. by headplates 22 shown asdetachably secured thereto by machine screws 23. Said cylinder heads 19are formed with air intake ducts 2% that connect' thecorresponding endsof the main air intake duct 17 with the interiors of the respectivecylinder heads. Seated in and normally closing the inner extremities ofthe ports 21 are check valves 25, the stems of which are slidablymounted in the hubs of spider brackets 26 formed within the cylinderheads. Nuts 27 on the stems of the check valves limit the openingmovements of said valves.

At its closed side and near the top thereof, the casing 11 is providedwith an exhaust muflier and, as shown, with a plurality of exhaust ports28. The exhaust mufller illustrated comprises two discs 29 and 30having, respectively, exhaust ports 31 and 32 and a cup-shaped cap 33having exhaust ports 34. By amachine screw 35, the cap 33 is caused toclamp the rims of the discs 29 and 30 tightly against the adjacent sideof the casing. The disc 29 is set with its ports 31 out of registrationwith the ports 28, and the disc 30 is set with its ports out ofregistration with the ports 31. Both of said discs 29 and 30 are offlexible material, such as vulcanized paper or the like, so that airexhausted from the casing will be resisted slightly .by the saidperforated discs and the sound-muflling action is produced. 1

By reference to Fig. 6, it will be noted that the exhaust port from thecasing just described is located above the exhaust ports in the pistons,so that the air will be discharged on a line extending through theuppermost. portion of the casing and as far as possible away from thebody of oil.

The casing is adapted to contain oil, as indicated at y, and this oil isadapted to be introduced through a funnel-shaped tube 36 shown asprojected from one side of the casing .and provided with a normallyapplied closing plug 37. Y

Working within the cylinders 14 are hollow pistons 37 that are rigidlyconnected by a web or connecting portion 38 that is offset or at oneside of the common axis of the said pistons, thereby leaving thepistonconnecting member open at one side. At their opposing ends, thepistons are formed .with parallel vertically extended and longitudinallyopposed fiat bearing surfaces 39 that are closely engaged by the flatvertical through the sleeve 16 and bushing 44, there is provided on theshaft 42 a joint ring comprising a washer 45 and a pliable ring 45*. Atone side, to wit: at the side adjacent to the open side of the pistonconnection, the eccentric 41 -is provided with a peripheral flange 46that bears against the outer or adjacent side of the crosshead 40. Acoiled spring 47 is placed on the shaft 42 between the washer 45 and theeccentric 41. and exerts a force that keeps the washer 45 pressedagainst its seat and also causes the flange 46 of the eccentric 41 topress against the crosshead 40 and hold said crosshead seated at oneside against bearing surfaces 48 formed on the piston connection 39. Asshown, a washer 49 is interposed between the spring'47 and the eccentric41.

The shaft 42 may be driven in any suitable way, but, as shown, it isprovided at its outer end with a pulley 50 over which a power-drivenbelt, not shown, will be run to drive the pump.

Rigidly but detachably secured to the outer ends of the pistons 37, bymachine screws 51 or the like, are piston heads 52 that are formed withair intake ports 53 and with large valve seats 54. Tubular valve-guidingstems 55 are rigidly secured to the hubs of the piston heads 52and'project axially inward therefrom, and on these stems are slidablymounted inwardlyv opening check valves 56 formed with hubs that v areclosed at their inner ends. These check valves 56 are normally closed bycoiled springs 57 that are seated against the hubs of open. or spiderwebs 58 formed within the respective pistons. The tubular stems55prevent air from being caged within the closed hubs of the checkvalves 56 and,

as shown, these closed hubs are arranged to applied to 11 through largeairports 60, which, for

an important purpose presently to be noted,

are locatedin the tops of said pistons and as far as possible away fromthe body of oil 3 contained within the casing.

As a means for splashing oil onto the cocentric 41 and crosshead 40, thelatter is shown as formed with a depending splashing arm or blade 61,the lower end of which projects downwardly slightly into the oil g.

It will be noted that the openin in the casing that is normally closedby the head plate 12 is of such size that when said head is removed, theeccentric and crosshead may be freely moved laterally outward throughsaid opening, thus permitting the said head 12, shaft 42, eccentric andcrosshead to be removed from the casing without disas sembling the saidparts just noted.

When the pump is in action, the diametrically opposed pistons will, ofcourse, be simultaneously reciprocated and alternately givenair-compressing actions, so that the compression of air will besubstantially continuous. When a piston moves from the outer end towardthe inner end of its cylinder, its check valve 56 will remain closed andthe check valve 25 in the outer end of said cylinder will freely open,thus causing air to be drawn into the outer end of that cylinder. Ofcourse, the air thus drawn into the cylinder will be drawn from thevacuum'tank or other place where vacuum or suction is to be produced.When the said piston is given its reverse or outward movement, the checkvalve25 just noted will be closed and the check valve 56 will open,permitting the caged air to be forced into the interior chamber of saidpiston and from thence through the port 60 into the upper portion of thecasing, and from thence outward through the exhaust mufiler described.Here it is important to note that theair discharged from the pistonswill be directed upwardly into the upper portion of the casing and awayfrom the body of oil and in a direction away froin the splashed oil, sothat the tendency that would otherwise be produced to carry some of theoil with the exhausted air is eliminated or reduced to nil.

In previous practice, with air ports located at the bottoms of thecylinders, much trouble has been experienced by thefact thatconsiderable oil would be carried away with the exhausted air.

The statements above made are based on experience with actualworkingpumps.- The drawings illustrate a commercial form of the pump,but it will be understood that trated as an air compressor. Also, itshould be understood that while the pump is priby slight modification orin the form illusneeaeee marily designed and has been particularlydescribed as an'air pump, it is capable of pumping any kind of liquid.

'hat I claim is:

1. In a pump of the kind described, the combination with a casingadapted to contain oil and having a laterally extended cylinder, of ahollow piston workin within said cylinder, inwardly openin chedl: valvesin the outer end of said cylinder and in the outer end of said piston,and means for reciprocating said piston and for splashing oil withinsaid casing, said casing having an air-discharge port and saidp1ston.having an air-discharge port opening from the upper portionthereof and arranged to discharge air into the upper portion of saidcasing and away from the oil therein contained.

2. The structure defined in claim 1 in which the air-discharge port insaid casing is. at the upper portion thereof.

3. In a pump of the kind described, the combination wlth a casingadapted to contain oii and having axially spaced and aligned cylinders,of opposed hollow pistons working in said cylinders, check-valveequipped air intake ports in the outer ends of said cylinders,check-valve-equipped air intake ports in the outer ends of said hollowpistons, and ineans for reciprocating said pistons and for splashing theoil within said casing, said casing having an air discharge port andsaid pistons in their upper sides having air-discharge ports arranged todi rect air into the upper portion of said casing and away from the oiltherein contained.

4. The structure defined in claim 3 in which the air-discharge port fromsaid casing is at the upper portion thereof and above the air-dischargeport in said piston.

5. In a pump of the kind described, the combination with a casingadapted to contain oil and having horizontally opposed cylinders, ofrigidly connected hollow pistons workin in said cylinders, inwardlyopenlng cheer-valves applied in the outerends of said cylinders andpistons, a. cross head en aging between said pistons and mounted forvertical movements, an eccentric on which said crosshead is mounted,said crosshead having a de ending s lashing arm, and a shaft'journailedto. sai casin and to which said eccentric is secured, said pistonshaving air ports in their upper inner end portions and saidcasinghavmgan exhaust port in its up er portion. V 6. A pump of the inddescribed comprising a casing having opposed axially ali ed cylinderswith inwardly opening c eck valves in their outer ends,-pistons workingin saidcylinders and having inwardly open-- ing' check valves, a webrigidly connecting said pistons and located at one side of the axisthereof, leaving the connection open and a coiled spring at its otherside, a crosshead seated against said web and engaging opposing innerend surfaces of said pistons, an eccentric journaled in said crossheadhaving a peripheral flange enga ing that side of the crosshead that isat the open side of thepiston connection, a removable head applied tosaid casing at that side that is adjacent the flange on said eccentric,a shaft .journaled in said head plate and in the opposite side of saidcasing and to which said eccentric is secured, and a spring appliedaround said shaft and compressed between said head plate and eccentricand operating substantially as de-,

scribed.

7. In a pump of the kind described, the combination with a casing havingopposed axially aligned cylinders with inwardly opening check valves intheir outer ends, said casing having an air-discharge port leading tothe atmosphere, of pistons working in said cylinders and having inwardlyopening check valves, a web rigidly con necting said pistons and workingat one side of theaxis thereof, leaving the connection open at its otherside, a crosshead seated against the web and engaging the opposing innersurfaces of said pistons, an eccentric journaled in said crosshead andhaving a peripheral flange engaging that side of the crosshead that isat the open side of the a piston connection, a, removable head appliedto the casing at that side that is adjacent to the-flange of saideccentric, a shaft journaled in said head plate and in the opposite sideof said casing and to which said eccentric is secured for rotationtherewith, and means interposed between said eccentric and removablehead plate for holding said eccentric against lateral dis laceinent andcausing the latter to hold sai crosshead against lateral displacement.

8. A pump of the kind described comprising a casing having opposedaxially aligned cylinders with inwardly opening check valves in theirouter ends, pistons working in said cylinders and having inwardlyopening check valves, 9. web rigidly connecting said pistons and locatedat one side of the axis thereof, leaving the connection open at itsother side, a crosshead seated against said web and engaging opposinginner end surto said casing at that side that is a acent the flange onsaid eccentric(i a shaft journaled in said head plate an in the oppositeside of said casing and to which said eccentric is secured, a joint rinapplied around said shaft and enga ed wit said head plate to form atight joint, applied around said shaft between said oint ring andeccentric lac andholding said two elements against lateral displacementand in working position.

9. The structure defined in claim in further combination with a bushingapplied in the fixed wall of said casing in direct engagementwith theinner end ofsaid shat't, said bushing having a closed outer end.-

10. A ptunp comprising a casing having axially aligned opposed cylindersand provided with a main air duct formed directly therein andterminating substantially flush with the ends of said cylinders,cylinder heads detachably secured to the outer ends of said cylindersand equipped with check valves, said cylinder heads having formeddirectly therein air-intake conduits that lead 1 from the outer ends ofsaid main air duct to the said inwardly opening check valves, connectedhollow pistons working in said cylinders and provided with check valvesand with air ports, and means for reciprocating said pistons.

11. In a pump, the combination with a casing adapted to contain oil andhaving a laterally extended cylind r. oi a hollow piston working withinsaid cylinder. check valves controlling the flow of air through saidcylinder and piston. and means for reciprocating said piston and forsplashing oil within said casing, saidcylinder and easing having airports located above the level of the oil within said casing, the airport in said piston being in the upper portion thereof, whereby the air,in moving from the one port to the other, passes high above the oillevel.

12. In a pump, the combination with a casing adaptedrto contain oil andhaving opposed axially aligned substantially horizdhtal' cylinders, ofrigidly connected opposed hollow pistons working in said cylin-- ders,check valves controlling the flow of air through said cvlinder andpistons, and means for reciprocating said pistons and for splashing oilwithin said casing, said cylindor and easing having air ports locatedabove the level of 'the oil within said casing, the air ports in saidpistons being in the upper portions thereof, whereby the air in IDOVIDOfrom the one port to the other passes big 1 above the oil level.

A pump of the kind described compr s ng a casing having opposed axiallyaligned cylinders, pistons working in said cylinders, a web rigidlyconnecting said pistons and located at one side of the axis thereof,leaving the connection open at its other side, a crosshead seatedagainst said web and engaging the opposite inner end surfaces of saidpiston, an eccentric journaled in said crosshead and having a peripheralflange engaging that side of the crosshead that is at the open side ofsaid piston connection, a removable head applied to said casing at thatside that is adjacent to the flange on said eccentric, a shaft journaledin said head plate and in the opposite side of said casing and to whichsaid eccentric is secured, a spring applied around said shaft andcompressed between said head plate and eccentric and yieldingly holdingsaid eccentric and croshcad against lateral 'displacement. and checkvalve controlling the flow o'lnir through said cylinders and pistons.

In testimony whereof I afiix my signature.

naunrrs DINESEYN.

